Term
|
Definition
-large grouping of stars held together by gravity.
-They are made up of gas clouds and star clusters |
|
|
Term
spiral
elliptical
irregular |
|
Definition
what are the 3 types of galaxies |
|
|
Term
|
Definition
Name this type of galaxy
-bulge at center
-hot blue arms
-yellow middle
-earth is in this type of galaxy
-ex: Milky Way and Andromeda |
|
|
Term
|
Definition
Name this type of galaxy
-NO spiral arms
-bright center
-little dust and gas
-contains OLD stars
ex: M87 |
|
|
Term
|
Definition
Name this type of galaxy
-doesn't fit into any other class.
-"leftovers"
-ex: Large Magellanic Cloud |
|
|
Term
|
Definition
Edwin Hubble classified galaxies according to their ___________ |
|
|
Term
|
Definition
large clouds of gas where new stars are formed (born) and where stars explode |
|
|
Term
|
Definition
-tight group of stars that look like a ball
-contains OLDER stars
- located in the spherical halo of spiral galaxies
and near elliptical galaxies |
|
|
Term
|
Definition
-a group of closely grouped stars.
-Can be found along the spiral disk of a galaxy. |
|
|
Term
-to learn what earlier galaxies looked like
-to see how galaxies change over time
-get an idea how/what caused them to form |
|
Definition
| why do scientist study distant galaxies |
|
|
Term
|
Definition
the study of the universe's origin, structure and future |
|
|
Term
|
Definition
The ___ ___ ___ states the universe began with an explosion about 13.7 billion years ago |
|
|
Term
| expand forever and eventually grow cold and dark |
|
Definition
Astrophysicists NOW think that there is not enough matter in the universe to stop it expanding outward, so the universe will |
|
|
Term
|
Definition
Scientists think our galaxy, the Milky Way is probably this type of galaxy |
|
|
Term
|
Definition
what holds a galaxy together |
|
|
Term
|
Definition
a star is most likely born in a |
|
|
Term
|
Definition
Name this
-most distant objects
-look like tiny points of light
-most powerful energy sources in the universe
-can be as powerful as 10 trillion suns |
|
|
Term
Cosmic background radiation
(left over radiation from the Big Bang)
the radiation comes from all directions |
|
Definition
What is supporting evidence that the Big Bang happened |
|
|
Term
1-by measuring the distance to the farthest galaxies.
2- by calculating the age of nearby stars |
|
Definition
| Name 2 ways scientists can measure how old the universe is |
|
|
Term
| NO! our galaxy is NOTthe center of the universe. There is no measurable center or edge of the universe. ALL galaxies are moving outward and away from eachother |
|
Definition
| No matter what direction we look galaxies are moving AWAY from us, so does this mean our galaxy is the center of the universe? |
|
|
Term
|
Definition
| ALL distant galaxies are moving AWAY form ALL other galaxies. |
|
|
